/Engine/Plugins/MeshPainting/Source/MeshPaintingToolset/Public/MeshPaintHelpers.h
Checks whether or not a point is influenced by the painting brush according to the given parameters
bool IsPointInfluencedByBrush ( const FVector & InPosition, const [FMeshPaintParameters](API\Editor\MeshPaint\FMeshPaintParameters) & InParams, float & OutSquaredDistanceToVertex2D, float & OutVertexDepthToBrush )